ISIS: Missing routes unless debug isis snp-packets is enabled #5
Description
This happens for broadcast, FRR=DIS with a simulated broadcast topology
If there are topologies with more than ~5000 routes, then some ISIS LSPs seem to get
dropped. Enabling debug isis snp-packets fixes the issue.
Retested on git 9cdce03 (2017-08-08)
Same topology
Output without the debug:
osr-perf3# show ip route summ
Route Source Routes FIB (vrf Default-IP-Routing-Table)
kernel 1 1
connected 5 5
static 1 1
isis 6970 6969
------
Totals 6977 6976
and with the debug (correct):
osr-perf3# show ip route summ
Route Source Routes FIB (vrf Default-IP-Routing-Table)
kernel 1 1
connected 5 5
static 1 1
isis 7073 7072
------
Totals 7080 7079
Doing a binary search through the code, it seems to be the debug section in in isis_pdu.c - lines 1780-1792:
if (isis->debugs & DEBUG_SNP_PACKETS) {
zlog_debug(
"ISIS-Snp (%s): Sending L%d CSNP on %s, length %zd",
circuit->area->area_tag, level,
circuit->interface->name,
stream_get_endp(circuit->snd_stream));
log_multiline(LOG_DEBUG, " ", "%s",
isis_format_tlvs(tlvs));
if (isis->debugs & DEBUG_PACKET_DUMP)
zlog_dump_data(
STREAM_DATA(circuit->snd_stream),
stream_get_endp(circuit->snd_stream));
}
Just adding a isis_format_tlvs(tlvs) outside the debug (to be always executed) seems
to fix the issue. No idea why... (Didn't look further into it)
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